This may not be your cup of tea, but over time I'v fallen into the habbit of front loading body with barley flakes, and mashing on the cold side. No mash out. Good long slow sparge. The usual result is a dry beer that has texture, without the sweetness.
Even if you mash on the hot side I would recomend barley flakes. Only exsperience, and your own personal taste will tell you how much is too much. Anecdotaly, I've used as much (as) 3 pounds without any trouble. Try half a pound first.
EDIT: I forgot: Yes, lots is good, but not %50 percent of the grist unless you are a rice hull ninja.
Cheers.
--Adam Selene.